I'm not positive, but I believe the flight arrived into Terminal B, unloaded passengers, and then was pulled over to AA's gates at Terminal 3 for the return flight to LHR. The flight number, however, which I believe was flight 93, continued on to DFW.

It was introduced for the first time in, IINM, around 1993-1994, and operated until about 1996. It was then brought back in 1998, operating daily with an A300, and remained as such until around 2002, when it shifted to a 767-300ER, and then shifted to a 777 for just a few months (I think less than three) in 2003 before being ultimately cancelled in 2003.

It was a few things. First, yes, the loads on the route weren't fantastic. After 9/11, the market softened a bit and the airlines with more established presences in this market -- especially BA and Continental -- were able to weather it a bit better. Another issue was aircraft. For years, the route was operated with a daily A300 configured in a 3-class layout. However, after AA phased out the 3-class A300 subfleet, the route shifted to a 3-class 763, but after AA phased out the 3-class 763 fleet, the route (very temporarily) shifted to a 777. IIRC, it only operated with a 777 for a few months before the route was dropped. AA wanted to put the 777 on the route because the market demanded 3-class service because of competiton from BA and hybrid F/J cabins from CO and VS, and because AA consolidated all LHR flying on 777s. But, alas, at least for AA and UA, the market just couldn't support that much airplane.

I am surprised that nobody yet mentioned the B767-200. The EWR-LHR flight AA92 was a B767-200 in 1998/1999, I took that flight twice and I had a 200 twice. It was the time when the AA B767-200's were flown across the pond, and the A300's were flown from BOS, JFK and EWR to LHR in a three-class config. But yes you are correct about the A300, I remember that one although I have never flown on it across the Atlantic. LHR was the only destination in Europe to which AA ever flew from EWR.